The pregnant actress was seen at the new Los Angeles property with Steve in pictures obtained by TMZ.com.
According to the website, while Jenna and Steve have been living together for some time, the house is the first they will own as a couple, with Jenna's birthday just happening to coincide with the big move-in day.
The move comes after Jenna opened up the relationship she has with Steve, telling Entertainment Tonight of their chemistry: "You just know if you have it. It's the sparks that fly and it just works really well."
"I am in a really great place and totally in love. It's nice."
Jenna is currently expecting her first child with Steve. She's also mother to six-year-old daughter Everly with ex-husband Channing Tatum.